Drink Green Tea or Oolong Tea

Age affects metabolism, making it slow over the years, even if you start out with a fast metabolism. Differences in metabolism speed are evident in how easy or hard it is for people to gain or lose weight.

A slow metabolism burns fewer calories, thus storing more fat; that's why some people have difficulty losing weight by just cutting calories. A fast metabolism burns calories at a quicker rate, which explains why some people can eat a lot and not gain extra pounds.

• Add high-intensity interval training to your regular routine
• Eat proteins as they have a high thermic effect and take longer to be burned and absorbed by the body. Your metabolism increases when you eat and process food, a process called 'the thermic effect of food.'
• Do weight training. It increases muscle mass thus boosting metabolism.
• Drink green tea. Studies show it contains compounds that increase the calories and fat you burn. 

They won't really help you lose weight. Research suggests regularly sleeping in colder temperatures may be optimal for weight loss as they stimulate the production of brown fat, the "good" fat. Brown fat keeps us warm by burning through "bad" fat stores.

Turn down the heat at night. You'll trim your belly and your heating bills.

Hot sauce can boost your metabolism. But research suggests that more-palatable, mild peppers may have the same calorie-burning potential.

Pack your salads and stir-fry with sweet peppers-including bell peppers, pimentos, rellenos, and sweet banana peppers. They're just as effective as the hot stuff.